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Question
Write the equations of the reactions which take place at the cathode and anode when acidified water is electrolyzed.
Solution
Reaction at Cathode :
H+ + e- → H
H + H → H2
or 4H+ + 4e- → 2H2
Reaction at anode :
20H- - 2e- → H2O + O
or 4OH- - 4e- → 4OH
4OH → 2H2O + O2
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